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Anti-nRNP is a type of antibody. [1] [2] They are autoantibodies against some ribonucleoproteins. [3]
However, some researchers believe that MCTD is a clinically distinct entity and is strongly associated with the presence of titer high in antibodies Ribonucleoproteins (RNP). [4] It is estimated that up to 25% of people with systemic autoimmune disease could be considered to have UCTD. [5]
Anti-RNP antibodies are autoantibodies associated with mixed connective tissue disease and are also detected in nearly 40% of Lupus erythematosus patients. Two types of anti-RNP antibodies are closely related to Sjögren's syndrome: SS-A (Ro) and SS-B (La). Autoantibodies against snRNP are called Anti-Smith antibodies and are specific for SLE ...
Some disorders, such as systemic lupus erythematosus (SLE) may be more likely if several autoantibodies are present, while others, such as mixed connective tissue disease (MCTD) may be more likely if a single autoantibody, ribonucleic protein (RNP), is the only one present. Those who have more than one autoimmune disorder may have several ...
Passive hemagglutination was popular in the late 1970s, but very few studies have been done using them and was restricted to anti-Sm and anti-ribonuclear protein (RNP) antibodies. [5] Enzyme linked immunosorbent assay (ELISA) has become the most widely used technique for testing for anti-ENAs due to them being simple to perform, quantitative ...
Thus, anti-Sm and anti-RNP antibodies were discovered in 1966 and 1971, respectively. In the 1970s, the anti-Ro/anti-SS-A and anti-La/anti-SS-B antibodies were discovered. The Scl-70 antibody was known to be a specific antibody to scleroderma in 1979, however the antigen (topoisomerase-I) was not characterised until 1986.
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HLA-DR4 in the MHC is linked to both anti-RNP antibody responses and MCTD. [52] [53] The HLA class II phenotype/genotype most closely connected with scleroderma, HLA-DR5, and its subgroups, has been demonstrated to have a negative connection with MCTD. [54] [55] Another genetic feature of MCTD is the presence of anti-RNP antibodies.